{"schemaVersion":3,"id":"CVE-2021-47007","aliases":["UBUNTU-CVE-2021-47007","DEBIAN-CVE-2021-47007"],"status":"published","duplicateOf":null,"title":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix panic during f2fs_resize_fs()\n\nf2fs_resize_fs() hangs in below callstack with testcase:\n- mkfs 16GB image & mount image\n- dd 8GB fileA\n- dd 8GB fileB\n- sync\n- rm fileA\n- sync\n- resize filesystem to 8GB\n\nkernel BUG at segment.c:2484!\nCall Trace:\n allocate_segment_by_default+0x92/0xf0 [f2fs]\n f2fs_allocate_data_block+0x44b/0x7e0 [f2fs]\n do_write_page+0x5a/0x110 [f2fs]\n f2fs_outplace_write_data+0x55/0x100 [f2fs]\n f2fs_do_write_data_page+0x392/0x850 [f2fs]\n move_data_page+0x233/0x320 [f2fs]\n do_garbage_collect+0x14d9/0x1660 [f2fs]\n free_segment_range+0x1f7/0x310 [f2fs]\n f2fs_resize_fs+0x118/0x330 [f2fs]\n __f2fs_ioctl+0x487/0x3680 [f2fs]\n __x64_sys_ioctl+0x8e/0xd0\n do_syscall_64+0x33/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nThe root cause is we forgot to check that whether we have enough space\nin resized filesystem to store all valid blocks in before-resizing\nfilesystem, then allocator will run out-of-space during block migration\nin free_segment_range().","dates":{"published":"2024-02-28T08:13:27.159Z","modified":"2026-05-11T13:46:09.328Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":4.6,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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